interleaved_call.hpp

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#ifndef EAGINE_INTERLEAVED_CALL_HPP
#define EAGINE_INTERLEAVED_CALL_HPP
 
#include "branch_predict.hpp"
#include <utility>
 
namespace eagine {
 
template <typename Func, typename SepFunc>
class interleaved_call {
public:
    interleaved_call(Func func, SepFunc sep_func)
      : _func(func)
      , _sep_func(sep_func) {}
 
    template <typename... P>
    auto operator()(P&&... p) {
        if(EAGINE_LIKELY(!_first)) {
            _sep_func();
        } else {
            _first = false;
        }
        return _func(std::forward<P>(p)...);
    }
 
private:
    Func _func;
    SepFunc _sep_func;
    bool _first{true};
};
 
template <typename Func, typename SepFunc>
interleaved_call(Func func, SepFunc sep_func)
  -> interleaved_call<Func, SepFunc>;
 
} // namespace eagine
 
#endif // EAGINE_INTERLEAVED_CALL_HPP